I have been without a phone since Thursday (it is now Saturday night) because I purchased a new phone and when they went to activate it, they deactivated my old phone.

This was before the agent realized that they could not activate any new prepaid phones.  This has been an issue since they began an upgrade on 10/4 and was to be completed by 10/5.  It is now 10/11 and after spending over 10 hours on the phone, escalating all the way up to tier 3 support and in a physical store speaking with the store manager, they are still unable to give me any service on either my old phone or new one! I use this line for a business! The only option is to create a new account but they stated if they create a new account they still will be unable to activate a prepaid phone.

This is pathetic.  When will you resolve this issue?

I work in IT and having an issue like this for 7 consecutive days, leaving customers without service, is a complete lack of competence.